Hanoi
3,359 km²
London
1,572 km²
Vietnam
UK
Area Comparison
Hanoi is 2.1x larger than London
Population Comparison
Hanoi has 1.1x fewer people than London
Yes — Hanoi is 2.1x larger than London by area. Hanoi spans 3,359 km² (1,297 mi²) while London covers 1,572 km² (607 mi²) — a difference of 1,787 km². You could fit London inside Hanoi approximately 2 times.
To put Hanoi's size in perspective, its area of 3,359 km² is about 1.2x smaller than Rhode Island. Meanwhile, London at 1,572 km² is about 1.4x smaller than Tokyo (city proper).
Picture Hanoi another way: its area is large enough to fit about 470,000 American football fields, 57 times the area of Manhattan, or 32 times the area of Paris. London works out to about 220,000 American football fields, 27 times the area of Manhattan, or 15 times the area of Paris.
Hanoi is the capital and second-most populous municipality of Vietnam. It encompasses an area of 3,358.6 km2 (1,296.8 mi2), and as of 2025 has a population of 8,807,523. Hanoi had the second-highest gross regional domestic product of all Vietnamese provinces and municipalities at US$48 billion in 2023, behind Ho Chi Minh City. It hosts 78 foreign embassies, the headquarters of the Vietnam People's Army (VPA), its Vietnam National University system, and other governmental organizations.
Known as "City Between Rivers", Hanoi covers 3,359 km² with a population of 8.1 million. The city was established in 1010. Hanoi is known for Hoan Kiem Lake, Old Quarter, Temple of Literature, among other attractions. The city's main transit system is the Hanoi Metro.
Hanoi encompasses 3,358.6 square kilometers and had a population of nearly 8.8 million as of 2025.
London is the capital and largest city of England and the United Kingdom, with a population of 9.1 million people in 2024. Its wider metropolitan area is the largest in Western Europe, with a population of 15.1 million. London stands on the River Thames in southeast England, at the head of a 50-mile (80 km) tidal estuary down to the North Sea, and has been a major settlement for nearly 2,000 years.
Often called "The Big Smoke", London has an area of 1,572 km² and is home to 9.0 million people. Its history stretches back to 43. Visitors come for Big Ben, Tower Bridge, Buckingham Palace, and much more. Getting around is easy with the London Underground.
London has been a major settlement for nearly 2,000 years, tracing its roots back to Roman times around 47 AD.
Looking beyond city limits, the London metropolitan area covers 8,382 km², which is 2.5x larger than greater Hanoi at 3,359 km². The London metro area is also more populous, with 14.3 million people compared to 8.1 million.
Hanoi has a population density of 2,397 people per km² — a moderately dense city. London, with 5,712 people per km², is a densely populated city. London is noticeably denser, packing 2.4 times more people per square kilometer.
This comparison spans continents — Hanoi in Asia versus London in Europe. Despite the geographic distance, comparing their sizes reveals surprising insights about how cities grow worldwide.
Hanoi has a humid subtropical climate while London experiences oceanic conditions. Summers are notably different: Hanoi averages 30°C compared to 19°C in London. When it's noon in Hanoi, it's 5:00 AM in London — a 7-hour time difference.
Size Ratio
London fits inside Hanoi ~2 times
Density Gap
London is 2.4x more densely populated
Time Difference
7 hours apart
History
London is ~967 years older
Hanoi covers 3,359 km². Cities with a similar urban footprint include Karachi (3,527 km²), Cairo (3,085 km²), Dubai (4,114 km²), Lima (2,672 km²), or Moscow (2,511 km²).
London covers 1,572 km². Cities with a similar urban footprint include Bangkok (1,569 km²), Bogotá (1,578 km²), São Paulo (1,521 km²), Johannesburg (1,644 km²), or Mexico City (1,485 km²).
The straight-line distance from Hanoi to London is 9,234 km (5,738 miles), with an estimated flight time of ~11h 22m.
Want to explore more? Compare city sizes for any two cities worldwide, or share your location live with friends.